/**
 * Copyright 2009-2020 the original author or authors.
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.ibatis.scripting.xmltags;

import ognl.MemberAccess;
import org.apache.ibatis.reflection.Reflector;

import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Member;
import java.util.Map;

/**
 * The {@link MemberAccess} class that based on <a href=
 * 'https://github.com/jkuhnert/ognl/blob/OGNL_3_2_1/src/java/ognl/DefaultMemberAccess.java'>DefaultMemberAccess</a>.
 *
 * @author Kazuki Shimizu
 * @since 3.5.0
 *
 * @see <a href=
 *      'https://github.com/jkuhnert/ognl/blob/OGNL_3_2_1/src/java/ognl/DefaultMemberAccess.java'>DefaultMemberAccess</a>
 * @see <a href='https://github.com/jkuhnert/ognl/issues/47'>#47 of ognl</a>
 */
class OgnlMemberAccess implements MemberAccess {

	private final boolean canControlMemberAccessible;

	OgnlMemberAccess() {
		this.canControlMemberAccessible = Reflector.canControlMemberAccessible();
	}

	@Override
	public Object setup(Map context, Object target, Member member, String propertyName) {
		Object result = null;
		if (isAccessible(context, target, member, propertyName)) {
			AccessibleObject accessible = (AccessibleObject) member;
			if (!accessible.isAccessible()) {
				result = Boolean.FALSE;
				accessible.setAccessible(true);
			}
		}
		return result;
	}

	@Override
	public void restore(Map context, Object target, Member member, String propertyName,
						Object state) {
		// Flipping accessible flag is not thread safe. See #1648
	}

	@Override
	public boolean isAccessible(Map context, Object target, Member member, String propertyName) {
		return canControlMemberAccessible;
	}

}
